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LTC1622IS8#TRPBF

Description
IC REG CTRLR BUCK 8SOIC
CategoryPower/power management    The power supply circuit   
File Size292KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LTC1622IS8#TRPBF Overview

IC REG CTRLR BUCK 8SOIC

LTC1622IS8#TRPBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSOIC
package instructionSOP, SOP8,.25
Contacts8
Manufacturer packaging codeS8
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage10 V
Minimum input voltage2 V
Nominal input voltage4.2 V
JESD-30 codeR-PDSO-G8
JESD-609 codee3
length4.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-45 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency625 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.9116 mm
Base Number Matches1
DEMO MANUAL DC232
NO-DESIGN SWITCHER
DESCRIPTIO
LTC1622 Low Input Voltage
Current Mode Step-Down
DC/DC Converter
out, the external P-channel MOSFET is turned on continu-
ously (100% duty cycle), providing low dropout operation
with V
OUT
V
IN
. To further enhance efficiency at low load
currents, the LTC1622 can be set up for Burst Mode
TM
operation or pulse skipping mode by either connecting the
SYNC/MODE pin to V
IN
or leaving it disconnected. The
LTC1622 can also be synchronized to an external clock at
frequencies of up to 750kHz. The LTC1622 is capable of
operating down to a 2V input voltage before the
undervoltage lockout feature is activated. Soft start is
provided by an external capacitor, which can also be used
to properly sequence supplies.
Gerber files for this circuit
board are available. Call the LTC factory.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Demo board DC232 is a step-down (buck) regulator using
the LTC1622. The exclusive use of surface mount compo-
nents results in a highly efficient application in a very small
board space. It is ideal for cell phones and other portable
electronics operating from one or two Li-Ion cells or three
to six NiCd cells. DC232 is capable of providing 1.5A at an
output voltage of 2.5V with an input supply of 4.2V. This
demo board highlights the capabilities of the LTC1622,
which uses a current mode PWM architecture to drive an
external P-channel power MOSFET. The results are a high
performance power supply that has low output voltage
ripple. Constant operating frequency makes the LTC1622
attractive for noise-sensitive applications. In addition,
high efficiency over wide load current range makes the
LTC1622 ideal for battery-powered applications. In drop-
PERFOR A CE SU
SYMBOL
V
IN
V
OUT
PARAMETER
Output Voltage
Input Working Voltage Range
V
FB
I
Q
Feedback Voltage
Typical Supply Current
Normal Mode
Shutdown
V
IN
= 4.2V, I
OUT
= 0mA
V
IN
= 4.2V, V
RUN/SS
= 0V
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
Efficiency vs Load Current
(Burst Mode Enabled)
100
V
IN
= 3.3V
90
V
IN
= 4.2V
90
EFFICIENCY (%)
Efficiency vs Load Current
(Burst Mode Defeated)
100
V
IN
= 3.3V
V
IN
= 4.2V
EFFICIENCY (%)
80
V
IN
= 8.4V
70
60
50
40
1
10
100
LOAD CURRENT (mA)
1000
DC232G01
80
70
60
50
40
1
10
100
LOAD CURRENT (mA)
1000
DC232 BP
DC232G02
V
IN
= 6V
V
IN
= 6V
V
IN
= 8.4V
V
OUT
= 2.5V
R
SENSE
= 0.03Ω
V
OUT
= 2.5V
R
SENSE
= 0.03Ω
U
WW
U W
U
U W
ARY
CONDITIONS
V
OUT
= 1.8V
I
OUT
= 800mA
I
OUT
= 800mA
I
OUT
= 800mA
VALUE
2V to 8.5V
3.3V
±
0.033V
2.5V
±
0.025V
1.8V
±
0.018V
0.8V
±
0.04V
400µA
15µA
Board Photo
1

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Description IC REG CTRLR BUCK 8SOIC IC reg ctrlr buck pwm CM 8-soic IC reg ctrlr buck pwm CM 8-msop IC reg ctrlr buck pwm CM 8-soic board eval for ltc1622ms8 IC REG CTRLR BUCK 8SOIC IC REG CTRLR BUCK 8MSOP IC REG CTRLR BUCK 8MSOP IC REG CTRLR BUCK 8SOIC IC REG CTRLR BUCK 8SOIC
Brand Name Linear Technology Linear Technology Linear Technology Linear Technology - Linear Technology Linear Technology Linear Technology Linear Technology Linear Technology
Is it Rohs certified? conform to incompatible incompatible incompatible - conform to conform to conform to conform to conform to
Maker Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) - Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code SOIC SOIC MSOP SOIC - SOIC MSOP MSOP SOIC SOIC
package instruction SOP, SOP8,.25 SOP, SOP8,.25 TSSOP, TSSOP8,.19 SOP, SOP8,.25 - SOP, SOP8,.25 TSSOP, TSSOP8,.19 TSSOP, TSSOP8,.19 SOP, SOP8,.25 SOP, SOP8,.25
Contacts 8 8 8 8 - 8 8 8 8 8
Manufacturer packaging code S8 S8 MS8 S8 - S8 MS8 MS8 S8 S8
Reach Compliance Code compliant not_compliant not_compliant not_compliant - compliant compliant compliant compliant compliant
ECCN code EAR99 EAR99 EAR99 EAR99 - EAR99 EAR99 EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE - CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Maximum input voltage 10 V 10 V 10 V 10 V - 10 V 10 V 10 V 10 V 10 V
Minimum input voltage 2 V 2 V 2 V 2 V - 2 V 2 V 2 V 2 V 2 V
Nominal input voltage 4.2 V 4.2 V 4.2 V 4.2 V - 4.2 V 4.2 V 4.2 V 4.2 V 4.2 V
JESD-30 code R-PDSO-G8 R-PDSO-G8 S-PDSO-G8 R-PDSO-G8 - R-PDSO-G8 S-PDSO-G8 S-PDSO-G8 R-PDSO-G8 R-PDSO-G8
JESD-609 code e3 e0 e0 e0 - e3 e3 e3 e3 e3
length 4.9 mm 4.9 mm 3 mm 4.9 mm - 4.9 mm 3 mm 3 mm 4.9 mm 4.9 mm
Humidity sensitivity level 1 1 1 1 - 1 1 1 1 1
Number of functions 1 1 1 1 - 1 1 1 1 1
Number of terminals 8 8 8 8 - 8 8 8 8 8
Maximum operating temperature 85 °C 70 °C 70 °C 85 °C - 85 °C 70 °C 70 °C 70 °C 70 °C
Maximum output current 1 A 1 A 1 A 1 A - 1 A 1 A 1 A 1 A 1 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP TSSOP SOP - SOP TSSOP TSSOP SOP SOP
Encapsulate equivalent code SOP8,.25 SOP8,.25 TSSOP8,.19 SOP8,.25 - SOP8,.25 TSSOP8,.19 TSSOP8,.19 SOP8,.25 SOP8,.25
Package shape RECTANGULAR RECTANGULAR SQUARE RECTANGULAR - RECTANGULAR SQUARE SQUARE RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE - SMALL OUTLINE SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) 260 235 235 235 - 260 260 260 260 260
Certification status Not Qualified Not Qualified Not Qualified Not Qualified - Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.75 mm 1.75 mm 1.1 mm 1.75 mm - 1.75 mm 1.1 mm 1.1 mm 1.75 mm 1.75 mm
surface mount YES YES YES YES - YES YES YES YES YES
Switch configuration SINGLE SINGLE SINGLE SINGLE - SINGLE SINGLE SINGLE SINGLE SINGLE
Maximum switching frequency 625 kHz 625 kHz 625 kHz 625 kHz - 625 kHz 625 kHz 625 kHz 625 kHz 625 kHz
technology CMOS CMOS CMOS CMOS - CMOS CMOS CMOS CMOS CMOS
Temperature level INDUSTRIAL COMMERCIAL COMMERCIAL INDUSTRIAL - INDUSTRIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface Matte Tin (Sn) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) - Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING GULL WING - GULL WING GULL WING GULL WING GULL WING GULL WING
Terminal pitch 1.27 mm 1.27 mm 0.65 mm 1.27 mm - 1.27 mm 0.65 mm 0.65 mm 1.27 mm 1.27 mm
Terminal location DUAL DUAL DUAL DUAL - DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 20 20 20 - 30 30 30 30 30
width 3.9116 mm 3.9116 mm 3 mm 3.9116 mm - 3.9116 mm 3 mm 3 mm 3.9116 mm 3.9116 mm
Base Number Matches 1 1 1 1 - 1 1 1 1 1
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